حَدَّثَنَا ابْنُ بَشَّارٍ، حَدَّثَنَا مُحَمَّدُ بْنُ جَعْفَرٍ، حَدَّثَنَا شُعْبَةُ، عَنْ أَبِي شُعَيْبٍ، عَنْ طَاوُسٍ، قَالَ سُئِلَ ابْنُ عُمَرَ عَنِ الرَّكْعَتَيْنِ، قَبْلَ الْمَغْرِبِ فَقَالَ مَا رَأَيْتُ أَحَدًا عَلَى عَهْدِ رَسُولِ اللَّهِ صلى الله عليه وسلم يُصَلِّيهِمَا ‏.‏ وَرَخَّصَ فِي الرَّكْعَتَيْنِ بَعْدَ الْعَصْرِ ‏.‏ قَالَ أَبُو دَاوُدَ سَمِعْتُ يَحْيَى بْنَ مَعِينٍ يَقُولُ هُوَ شُعَيْبٌ يَعْنِي وَهِمَ شُعْبَةُ فِي اسْمِهِ ‏.‏

Narrated Tawus: Ibn 'Umar was asked about praying two rak'ahs before the Maghrib prayer. He replied: I did not see anyone praying them during the time of the Messenger of Allah (PBUH). He (Ibn Umar) permitted to pray two rak'ahs after the Asr prayer. Abu Dawud said: I heard Yahya b. Ma'in say: The correct name of the narrator Abu Shu'aib is the Shu'aib. Shu'bah made a mistake in narrating his name. Translation Not Available

Book Ref: Sunan Abi Dawud Book 5 Hadith 1284
Web Ref:  Sunan Abi Dawud Book 5 Hadith 1279